HEMIPTERA : TREE HOPPERS. 183 



called the Seventeen Year Locust, but it is in no sense 

 a Locust, and should not be called by this name. The 

 name " Se\'enteen Year" is given to it from the belief 

 that it appears in the same place only once in seven- 

 teen years. 



The Dogday Harvest Fly is over an inch long, the 

 body black above, marked with green, and the under 

 side covered with a white substance resembling flour. 

 It appears at the beginning of the dog days, and its sing- 

 ing may be heard among the trees through the middle 

 of the day. The pup^ of this species and of the Sev- 

 enteen Year Cicada, as they come out of the ground 

 and crawl up the trees, look like Beetles. Soon the 

 pupa skin splits on the top of the back, and from the 

 opening thus made the perfect insect comes forth, 

 leaving the brown pupa skin attached firmly to the 

 tree, and at a little distance looking as when alive. 



Tree Hoppers. 



These Insects are remarkable for their curious and 

 often grotesque shapes. They live on the sap of trees 



Fig. 318. — Tree Hopper. Fig. 319. — Same enlarged. 



and herbs, and imbibe it in such quantities that it 

 oozes out of the body, often concealing the insect in a 

 mass of frothy matter or foam. Figure 318 shows a 

 common kind, as seen when looking upon its back ; 

 Figure 319 is the same in profile, considerably enlarged. 



